Saw frame



Sept. 14 1926. 1,599,642 J. E. BURBANK SAW FRAME' Filed Jam 25, 1926-JEBurZmz/a,

Patented Sept. 14, 1926.

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caries E. BURBANK, or FLAGSTAFF; MAINE.

sAw FRAME.

Application filed January 23, 19'2'6. Serial at. 83,361.

This invention relates to saw frames and more particularly to theconstruction of frames of that typeof sawusually employed for cuttinglog wood.

An important object of the invention is to provide means for tensioningthe frame to hold the saw blade therein of such character that the framemay be very readily inserted and removed and at the same time the frameis free from portions which, when engaged by obstructions, will tend torelease the saw blade and permit it to escape from the frame.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawing, wherein Figure1 is a side elevationpartially in section of a sawframe constructed inaccordance with my invention;

Figure 2 is a plan view thereof;

Figure 3 is an enlarged detail view showing the manner of mounting thelongitudinal bar in the end members;

Figure 4 isan enlarged detail View taken on the line 44 of Figure 1;

Figure 5 is an enlarged detailview showing the connection between thelinks and the operating lever.

Referring now more particularly to the drawing, the frame includes endmembers and 11, each provided intermediate their ends in adjacent facesthereof with notches 12 and 13 for the reception of the ends of alongitudinal brace 14. The end members 10 and 11 adjacent correspondingends thereof have pins 15 and 16 for engagement with the ends of a sawblade 17 in the usual manner. The opposite ends of the end members 10and 11 are connected by a tensioner 18, now to be more particularlydescribed.

The tensioner includes a link 19 having at one end an eye 20 forengaging the upper end of the end member 11 which constitutes the handleof the saw frame, a second link 21 having an eye 22 for engagement withthe upper end of the end frame member 10 and a lever 23 connecting thesemembers. The link 21 is formed in two sections, one of which provides aneye 22 and has at its inner end a yoke 24 slidably receiving the secondsection 25. This second section is provided with series oflongitudinally spaced openings 26 through which a pin 27 may be directedoutwardly of the yoke 24 to determine the effective length of the link.The inner end of the section is downturned, as at 28, and extendsbetween spaced arms 29 formed up'oiithe lever 23 bein connected theretoby a pivot 30. The outer or forward end of the link 20 is upturned, asat 31, and likewise directed between the arms 29 being connected theretobya pivot 32. The rear end of the lever 28 is formed with a downturnedend 33 operating adjacent the link 19 and having upon its faceconfronting the link ahratchet shoulder 34. Pivoted to the downturnedend 33 is an arm 35 having a second ratchet shoulder 36 for engagementwith the link.

It will, of course, be understood that due to the connections of thelever 23 to the links 19 and 21, the upper ends of the end members 10and 11 may be drawn together or permitted to separate. When these upperends are drawn together, the frame is tenwere sioned as the framemembers tend to rock about the longitudinal bar 14 and are rcstrained bythe blade 17 When the shoulder 36 is in engagement with the link 19, thetension is just sufficient to hold the frame of the saw in assembledrelation while, when iii) the shoulder 34 is engaged, this tension isincreased to apply the proper tension to the saw blade. While the notch36 is engaged,

the frame may be sprung by applying weight thereto for a sufficientdistance to permit the saw blade to be removed and replaced, thuspermitting the use of the bar 14, such as is illustrated instead of theusual bar which is mortised into the end members. Attention is directedto the fact that the position of the lever 23 is such that it isprotected from accidental disengagement by contact with the brush andother obstructions such as are met with in using a saw of this characterfor cutting pulp wood or the like in the forest. At such times the arm35 may be swung back upon the lever, as indicated in dotted lines inFigure 1, so that it will not tend to catch upon obstructions.

It will, of course, be understood that the construction hereinbefore setforth is obviously capable of a certain range of change and modificationwithout materially departing from the spirit of the invention and Iaccordingly do not limit myself to such specific structure except ashereinafter claimed.

I claim In a saw frame of the type described, end members, alongitudinally extending bar up on which the end members are looselyfulcruined intermediate their ends, a saw blade connecting correspondingends of the end members, a link connected with the opposite end of eachof the end members, a lever connecting said links and securable in aposition Where the frame is tensioned to thereby tension the saw bladeor to a position Where the tension is removed from the saw blade Whilemaintaining the sections of the frame in assembled relation including anangular end on said lever having a shoulder adapted to engage With oneof said links and an arm pivoted to said angular end and having a secondshoulder for engagement With said link, said arm being swingable aboutthe pivot thereof from an operative position Where it aligns with theangular end of the first named arm to an inoperative position Where theshoulder thereof engages the upper surface of the lever to support thearm in inoperative position.

In testimony whereof I hereunto afiix my signature.

JAMES E. BURBANK.

